Skiving machine



April 11', 1939.

F. w. BACKUS SKIVING MACHINE Filed Nov. 2, 1957 2 Sheets-Shet 1 SKIVING MACHINE Filed Nov. 2, 1937 2 Sheets-Sheet 2 T lllllllllllll] UUJUHLU.

Fig. 6.

WVE/VTUR ran Patented Apr. 11, 1939 UNITED STATE$ PATENT OFFICE SKIVING MACHINE Floyd W. Backus, St.

Louis, Mo., assignor to Application November 2, 1937, Serial No. 172,413

5 Claims.

This invention relates to skiving machines and is herein illustrated as embodied in a machine for skiving parts of the uppers of boots and shoes.

In the manufacture of shoes, it is sometimes desirable to produce rapidly in succession scarves of three difierent predetermined inclinations and widths, for example upon the same piece of leather. In prior machines two such scarves have been produced by providing means for varying the relative angular position of the knife and the work-supporting feed roll of a leather skiving machine, such means including a controlling member movable at the willof the operator between two stops. When the member is moved into engagement with one stop a scarf of a given width and inclination is produced, and when the member is moved into engagement with the other stop, a dififerent scarf is produced.

To permit scarves of three different predetermined inclinations to be produced at will by rapid adjustment of the controlling member, there is provided, according to the present invention, a third stop so that the relative angular position of the knife and the Work support may be instantly and accurately changed from one position to either one of two others.

Referring to the accompanying drawings,

Fig. l is a front elevation of a portion of a skiving machine in which the present invention is embodied;

Fig. 2 is a detail in elevation of the knife and feed roll, a piece of work being shown in process of being skived, and the roll being shown in three different angular positions;

Fig. 3 is a plan of a short Blucher vamp having upon its margins scarves of three different widths and inclinations;

Fig. 4 is a detail in elevation on enlarged scale of the third stop and the controlling member with which it cooperates;

Fig. 5 is a view principally in front elevation of a modified form of a third stop; and

Fig. 6 is an end elevation of the third stop.

In skiving the margins of pieces of leather it is frequently desirable to be able to produce rapidly in succession three scarves of different in clinations and widths and to produce them in any'desired order. For example, the Blucher vamp shown in Fig. 3 has a wide scarf A of gradual inclination along its forward end, a narrow scarf B of steep inclination along its throat, and two scarves C, D along the inside of the wings which are alike and are intermediate as to width and inclination between the scarf A and the scarf B.

The illustrated machine is or may be similar to the machine of United States Letters Patent No. 1,866,918, granted July 12, 1932, upon an application filed in the name of Milton H. Ballard; and before proceeding to describe what is new, a brief description of the old construction will be given. The machine comprises a rotary disk knife l, a feed roll 9, a feed disk II and an edge guide and presser l3. The feed roll shaft is rotatable in a block ll which is adjustable substantially horizontally in a carrier [9, said carrier being adjustable in a curved guideway the axis of curvature of which passes through the upper inner corner of the roll when the horizontally adjustable block I1 is in the position shown. In order to provide means for tilting the feed roll carrier I9 by sliding it in its curved guideway, this carrier is connected by a link 2| to one arm 25 of a bell-crank lever pivoted at 21 to the frame of the machine, the other arm 29 of the bellcrank lever having pivoted to it the upper end of a treadle rod 3|. The upper end of the arm 25 carries a block 23 which swings with the arm. Attached to the lower end of the treadle rod 3| is a toe-and-heel treadle, not shown. When the heel end of this treadle is depressed to push up the rod 3|, the block or controlling member 23 is swung to the left. When the toe end is depressed to pull the rod 3| down, the block 23 is swung to the right. The position of this controlling member thus determines the angular position of the feed roll and hence the inclination of the scarf which will be produced. Two adjustable stops 33, 35, threaded on a small rod 38, limit the extent of movement of the controlling block 23. Thus the feed roll may quickly be moved to and held in either one of two predetermined angular positions. The feed disk H is mounted upon a bracket which is supported by the feed roll carrier l7, and consequently the relation between the feed disk and the feed roll remains unchanged. The work Hill is fed away from the observer in'Figs. l and 2, the controlling block 23 being held in engagement with one or other of the steps 33, 35. Referring now to Fig. 2, three different angular positions of the feed roll are shown, the tipping of the roll having been somewhat exaggerated for the purpose of illustration. In the left-hand full line position indicated at AA a wide scarf of gradual inclination such as the scarf A of Fig. 3 will be produced, and the controlling block 23 will be in engagement with the left-end stop 33 which has previously been adjusted into the proper position. In the right-hand dot-and-dash position of the roll 9, indicated at BB in Fig. 2, the treadle rod 3| will have been pulled down to hold the controlling block 23 against the rightend stop 35, and a very narrow scarf of much greater inclination, such as the scarf B of Fig. 3, will be produced. The machine as thus far described is or may be substantially the same as the machine of the patent to which reference is made for details not herein described.

In order to permit the feed roll to be moved into a predetermined intermediate position such, for example, as that indicated at CD in Fig. 2, to produce scarves such as those indicated at C and D in Fig. 3, a third stop is provided which may be adjusted so as to permit the control block 23 to be held in any desired position between the stops 33 and 35. This stop takes the form of a thin flat resilient member 31 the right-hand end of which is fastened by a clamping screw 39 and a clamping plate 4| to a stationary bracket 42. The stem of the screw passes through a slot in the stop 31 so that the stop may be adjusted lengthwise. The stop 37 has near its left-hand end a projection 43 adapted to engage a small recess 45 formed in the top of the block when the stop is moved beneath it. Assuming now that it is desired to move the feed roll into and hold it in an intermediate angular position such as that indicated at CD in Fig. 2, the third stop 31 will be adjusted into a position in which the projection 43 will snap into the recess 45 in the block when the roll 9 has been swung into the desired intermediate position. Since the stop 31 is resilient, the operator, by exerting sufficient force upon the treadle rod 3|, may move the block 23 from engagement with the stop 33 past the stop 31 and into engagement with the stop 35 and back again if he so desires. However, by modulating the force which is used to manipulate the treadle rod 3|, the operator may cause the stop 31 to be effective when desired. In the operation of the machine, for example upon the Blucher vamp shown in Fig. 3, the operator may make the various scarves in different orders. The scarf A may be made first with the block 23 in engagement with the stop 33; the scarf B may next be made with the block 23 in engagement with the stop 35; and, finally, the scarves C and D may be made with the block in engagement with the stop 31. The scarves may also be made in the order A, C, B, D or in whatever order the operator may desire.

A modified construction is shown in Figs. 5 and 5. In this construction the threaded rod. 38 of Fig. 1 has been replaced by a longer threaded rod 38, and the control block 23 has been replaced by a control block I23 having no recess in its upper face. This block is mounted, as is the block 23 of Fig. l, in the upper part of one arm 25 of a bell-crank lever pivoted to the frame at 21, the other arm 29 of the bell-crank lever being pivoted at its upper end to the upper end of the treadle rod 3%; and, as in the construction shown in Fig. l, a link 2| connects the arm 25 with the feed roll carrier. As thus far described, with the exception of the threaded rod I38, and the block E23, the construction is or may be the same as that of the patented machine.

The third or intermediate stop in this modification consists of an arm 5| having a downturned end which may be caused to lie in the path of movement of the block I 23. This arm has a hollow hub into which is tightly driven a hear-- ing sleeve 53, said sleeve being rotatably and slidably mounted on the threaded rod I38. A compression spring 54 urges the sleeve 53 and with it the stop 5| to the left as far as a nut 55, threaded on the rod I38, will permit. By turning the nut, the stop 5| may be adjusted lengthwise of the rod I38 so that its downturned end may be caused to occupy various predetermined positions between the stops 33 and 35. The stop 5| is normally held in the operative position shown in which it lies in the path of movement of the block I23. To this end the hub of the stop 5| has projecting rearwardly from. it an actuating arm' |5I to the outer end of which is pivoted the upper end of a second treadle rod 5*! which is urged upwardly by a tension spring 59 so as to rock the hub of the stop 5| clockwise as viewed in Fig. 6. A projection 25| on the hub of the stop 5|, by contacting with the side of a screw 6|, limits the extent of this rocking movement. When the parts are in the normal positions shown the stop 5| is operative with its downturned end in the path of movement of the block With this construction, the wide scarf A (Fig. 3) of gradual inclination may be produced by holding the treadle rod 5'! down to render the third stop 5| inoperative and by moving the treadle rod 3| to its uppermost position, the block I23 then being in engagement with the stop 33. The narrow scarf B of great inclination may now be produced by still holding the treadle rod 51 down and pulling down the treadle rod 3| to cause the block I23 to move to the right (Fig. 5) into contact with the stop 35. The intermediate scarves C, D may then be produced byfirst permitting the treadle 5'! to rise, whereby the stop is moved into operative position and pulling down upon the treadle rod 3|, whereupon the block 523 is moved to the left into engagement with the downturned end of the stop 5|.

Although the invention has been set forth as embodied in two illustrative constructions, it

should be understood that the invention is not limited in the scope of its application to the particular constructions which have been shown and described.

Having described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. A skiving machine having, in combination, a knife, a feed roll, an operator-controlled member movement of which varies the relative angular position of the knife and roll, two stops serving as limits to said movement so as to predetermine the two extreme relative angular positions of the knife and the roll, and a third stop adapted to arrest the movement of said member in a position between the two first-named stops so as to adjust the knife and roll into an intermediate relative angular position.

2. A skiving machine having, in combination, a knife, a feed roll, an operator-controlled member movement of which varies the relative angular position of the knife and roll, two stops serving as limits to said movement so as to predetermine the two extreme relative angular positions of the knife and the roll, and a third stop adapted to arrest the movement of said member in a position between the two first-named stops so as to adjust the knife and roll into an intermediate ment of which changes the angular position of the roll, treadle-controlled means for moving said member, two stops arranged to limit the movements of said member in opposite directions so as to predetermine the two extreme angular positions of the roll, and means for arresting the movement of said member in a position between the two stops so as to adjust the roll into an intermediate predetermined angular position.

4. A skiving machine having, in combination, a knife, a feed roll angularly adjustable to vary the width of the scarf produced, an operatorcontrolled member movement of which changes the angular position of the roll, two stops arranged to limit the movements of said member in opposite directions so as to predetermine the two extreme angular positions of the roll, and a third stop arranged to arrest the movement of said member in a position between the two stops so as to adjust the roll into an intermediate predetermined angular position.

5. A skiving machine having, in combination, a knife, a feed roll, a member movement of which varies the relative angular position of the knife and roll, said member having in it a recess, two stops serving as limits to the movement of said member so as to predetermine the two extreme angular positions of the knife and roll, and a third stop adapted to engage the recess in said member whereby said member may be held in a position intermediate the two first-named stops.

FLOYD W. BACKUS. 

